Mix mode to Native mode - what could go wrong?

Hi, we currently have a domain and a child domain. No NT or Exchange 5.5 servers. Just Win2000, 2003 and Exch2000 servers. Our child domain runs our SAP servers. We also have a MS Certificate Authority server that handles only RADIUS authentications.
If we change our domain from mix to native mode, what can go wrong? I really don't want to crash anything, especially our SAP.

In this video we show how to create an Address List in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Organization >> Ad…

This tutorial will walk an individual through the steps necessary to join and promote the first Windows Server 2012 domain controller into an Active Directory environment running on Windows Server 2008.
Determine the location of the FSMO roles by lo…